s=int(input())
s1=''
for a in s:
    if (a=='(' or a=='{' or a=='[' or a=='<') or s1==''
        s1+=a
    elif s1!='':
        if (a==')' and s1[-1]=='(') or (a=='}' and s1[-1]=='{') or (a==']' and s1[-1]=='[') or (a=='>' and s1[-1]=='<') :
            s1=s1[:-1]
    if s1=='':
        print('Верная')
    else:
        print('Неверная')